Surely, it is up to the Committee of the club to decide how to deal with such issues? They could have conditions such as:
All 18 holes must be in play;
A minimum number of holes must be in play, and if they are, just get on with it (it is winter)
Is it not dangerous asking the individual players to deal with it themselves? Inevitably, someone will feel like they are losing out. Or, the team that loses may be upset, because they may feel if all 18 holes were open, they could have pulled it back in last 2 holes. Besides, what if they agreed to something that was advised on this thread, and it conflicted with guidelines for that competition set by the Committee?